Hi there,
you could create the ‘menu bar’ using the Block Element:
https://docs.generatepress.com/article/block-element-overview/
And the Generate Blocks plugin to create a Container Block with a row of Buttons:
https://wordpress.org/plugins/generateblocks/
In the Block Element you would choose the Hook > generate_after_footer
If you give the Container Block > Setting > Advanced > Additional CSS of:
hide-on-desktop mobile-navigation
Then add this CSS to fix it to the bottom of the browser:
@media(max-width: 769px) {
.mobile-navigation {
position: fixed;
bottom: 0;
left: 0;
width: 100%;
z-index: 10000;
}
body {
margin-bottom: 80px; /* change this value to height of mobile nav */
}
}